缓进给强力磨削深沟槽表面二维残余应力的试验研究

应用电阻应变计法研究了缓进给强力磨削产生的深沟槽侧面的表面残余应力,结果表明,磨削加工后的表面残余应力随加工条件变化而变化的,最大的残余压应力出现在最表面上,该最大表面应力随砂轮转速或工件进给速度增加而减小,随磨削深度或磨削宽度减小而增大,工艺参数增大时残余应力层的厚度增加,在缓进给磨削加工中采用低砂轮转速,低工件进给速度、小磨削深度或小磨削宽度是有利的。最后,必须用一个特殊的喷嘴采用增大压力的冷却液清洗砂轮端面。

A TWO-DIMENSIONAL STUDY ON THE RESIDUAL STRESSES IN DEEP SLOT FLANK DUE TO CREEP FEED GRINDING

Utilizes a resistance strain gauge with anodic electrolysis technique to determine the surface residual stresses in a deep slot flank due to creep feed griding. Tests show that this kind of residual stress is closely related to the operation conditions in grinding and the maximum compressive residual stress occurs on the outmost layer of slot flank. This maximum compressive residual stress decreases with the increases in grinding wheel speed and in workpiece feeding speed, but increases with the decrease in grinding depth or width. Surface layer in which residual stress occurs will be thickened if operation parameters increase. Therefore it is beneficial to grinding a slot by creep feed grinding at lower wheel speed and workpiece feeding speed with shallow depth or narrow width. A specially designed nozzle is regarded as necessary to inject pressured coolant to clean the end surface of wheel.